P Polygon · click vertices, Enter / double-click / click first dot to close. Drag dots. Backspace pops a vertex. Esc cancels.
B Brush · [ ] size when brush is active · Alt erase
L Lasso · Shift add · Alt subtract
W Wand · tight pixel chroma at the click. Circle is sample size [ ]. Tolerance ; '. Shift add · Alt subtract.
I Magic · original stain fill (server) united with Smart Lab color. Click and wait — it loads and grows through rust/corrosion, not a circle. Drag to raise tolerance. Extra clicks add leftover rust. Ctrl+click new. Alt subtract.
J MW-JS · Tamersoul magic-wand-js (RGB flood fill + border blur). Extra clicks add. ; ' threshold.
O OL · same library as OpenLayers magic wand. Click, then drag to raise the threshold live. Release to commit.
K QGIS · Kanahiro MagicWand: CIELAB delta-E + grow across smooth gradients, stop at sharp edges. Extra clicks add more seed colors.
U QGIS live · same QGIS fill as K, but click-and-drag like Smart: hold, drag to raise threshold, see the selection, release to keep.
Y Smart · Lab color, click-drag to grow in all directions, extra clicks add, fills holes. Sample size is the seed patch.
T Trace · Lab grow along the cursor only — it does not jump ahead of the pointer. Drag along the stain. Sample = how far beside the path.
R Rect rust · drag a yellow box around rust. On release it finds rust inside and outlines it — it does not fill the box. Click inside to add another stain. Esc clears the box.
M SAM · click the object. Crops around the pointer so it does not grab the whole tile. First use may download a small model.
V hide/show all overlays · hold V to peek at the photo · per-layer Hide/Show in the list
H / hold Space Pan · wheel zoom · F fit
Ctrl+click toggle masks in the list · Shift+click range · E / Ctrl+E merge selected into one mask (keeps the class of the last clicked) · Del deletes all selected
G grow selected · S shrink · E merge selected masks into one · 1–3 rust light/mod/heavy · 4–6 corrosion light/mod/heavy
A D prev / next in the top bar · N skip no decision
0 no rust on this image · Q reject
Ctrl+Enter save as done · Ctrl+Z undo · Ctrl+Y redo · Del delete selected masks
F fit · ? this panel